Growth and development in animals — KCSE Biology

KCSE Biology · 65 practice questions · 3 syllabus objectives

21 easy23 medium21 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Distinguish between continuous and discontinuous growth using growth curves

Describe metamorphosis with examples

Growth and development in animals

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easySHORT ANSWER2 marks

State two features of discontinuous growth in insects. (2 marks)

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Part (a) — 2 marks

Growth occurs in distinct stages or instars (1 mk)

Size increases suddenly following each molting process (1 mk)

easySHORT ANSWER2 marks

State two characteristics of continuous growth in animals. (2 marks)

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Part (a) — 2 marks

Growth occurs steadily throughout life without distinct phases (1 mk)

Size increases gradually rather than in sudden jumps (1 mk)

easySHORT ANSWER4 marks

Name two differences between the life cycles of frogs and butterflies. (4 marks)

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Part (a) — 4 marks

Frogs undergo external fertilisation, while butterflies undergo internal fertilisation (1 mk)

Frogs have a larval stage (tadpole) that lives in water, while butterflies have a caterpillar stage that is terrestrial (1 mk)

Frogs have a direct metamorphosis from tadpole to adult, while butterflies have a distinct pupal stage (1 mk)

Frogs primarily breathe through gills in the tadpole stage, while butterflies do not have gills at any stage (1 mk)

Name two factors that influence growth in animals and briefly explain their effects. (4 marks)

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